export default {
  namespaced:true,
  
  state:()=>({
    cart: JSON.parse(uni.getStorageSync('cart') || '[]')
  }),
  mutations: {
    addToCart(state,goods){
      const findResult = state.cart.find((x)=>x.goods_id === goods.goods_id)
      if(!findResult){
        state.cart.push(goods)
      }else{
        findResult.goods_count++
      }
      this.commit('m_cart/saveToStorage')
    },
    saveToStorage(state){
      uni.setStorageSync('cart',JSON.stringify(state.cart))
    },
    //更新购物车中商品的勾选状态
    updateGoodsState(state,goods){
      const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
        if(findResult){
          findResult.goods_state = goods.goods_state
          this.commit('m_cart/saveToStorage')
        }
    },
    //更新商品数量
    updateGoodsCount(state, goods){
      const findResults = state.cart.find(x=> x.goods_id === goods.goods_id)
      
      if(findResults){
        findResults.goods_count = goods.goods_count
        this.commit('m_cart/saveToStorage')
      }
    },
    //从购物车删除物品
    removeGoodsById(state,goods_id){
      state.cart = state.cart.filter(x => x.goods_id !== goods_id)
      
      this.commit('m_cart/saveToStorage')
    },
    updateAllGoodsState(state,newState){
      state.cart.forEach(x => x.goods_state = newState)
      this.commit('m_cart/saveToStorage')
    }
  },
  getters: {
    total(state){
      // let c = 0
      // state.cart.forEach(x => c+= x.goods_count)
      // return c
      return state.cart.reduce((total, item) => total += item.goods_count, 0)
    },
    //购物车中已勾选商品的总数量
    checkedCount(state){
      return state.cart.filter(x => x.goods_state).reduce((total, item) => total += item.goods_count, 0)
    },
    //已勾选商品的总价
    checkedGoodsAmount(state) {
      return state.cart.filter(x => x.goods_state).reduce((total, item) => total += item.goods_count * item.goods_price, 0).toFixed(2)
    }
  },
}